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    Coloured scanning electron micrograph (SEM) of epithelial cells lining the human trachea (windpipe). — Stock Photo
    Coloured scanning electron micrograph (SEM) of epithelial cells lining the human trachea (windpipe).
    Relation of thyroid and pituitary gland with labels — Stock Photo
    Relation of thyroid and pituitary gland with labels
    Pharmaceutical research. Potential new medicines and vaccines on electron micrograph of virus — Stock Photo
    Pharmaceutical research. Potential new medicines and vaccines on electron micrograph of virus
    Plasmodium ovale protozoan parasite and red blood cell in flow, computer illustration. — Stock Photo
    Plasmodium ovale protozoan parasite and red blood cell in flow, computer illustration.
    Digital illustration showing vaginitis caused by Candida albicans fungus and close-up of yeast cells. — Stock Photo
    Digital illustration showing vaginitis caused by Candida albicans fungus and close-up of yeast cells.
    Brain neural network, computer illustration. — Stock Photo
    Brain neural network, computer illustration.
    Measles virus particles budding from cells, digital illustration. — Stock Photo
    Measles virus particles budding from cells, digital illustration.
    Illustration of transparent cells with splitting nucleus, cell membrane and visible chromosomes. — Stock Photo
    Illustration of transparent cells with splitting nucleus, cell membrane and visible chromosomes.
    Snake red blood cells. Coloured scanning electron micrograph (SEM) of whole and fractured red blood cells (erythrocytes, red) in a small blood vessel of a snake — Stock Photo
    Snake red blood cells. Coloured scanning electron micrograph (SEM) of whole and fractured red blood cells (erythrocytes, red) in a small blood vessel of a snake
    Diseased blood cells with bacteria, computer illustration. — Stock Photo
    Diseased blood cells with bacteria, computer illustration.
    Skin cancer cell, computer illustration. — Stock Photo
    Skin cancer cell, computer illustration.
    Normal human red blood cell — Stock Photo
    Normal human red blood cell
    Digital artwork of human cells with cytomegalic inclusion disease symptom of cytomegalovirus infection. — Stock Photo
    Digital artwork of human cells with cytomegalic inclusion disease symptom of cytomegalovirus infection.
    Blood clot, computer illustration — Stock Photo
    Blood clot, computer illustration
    Human cytomegalovirus particles in blood flow, digital illustration. — Stock Photo
    Human cytomegalovirus particles in blood flow, digital illustration.
    Cancer cell morphology — Stock Photo
    Cancer cell morphology
    Flu viruses, computer illustration — Stock Photo
    Flu viruses, computer illustration
    Digital illustration of female reproductive system and Chlamydia trachomatis bacteria causing Chlamydial infection. — Stock Photo
    Digital illustration of female reproductive system and Chlamydia trachomatis bacteria causing Chlamydial infection.
    Panoramic illustration of blood vessel with eosinophilia with numerous eosinophils white blood cells, anti-parasite immune system. — Stock Photo
    Panoramic illustration of blood vessel with eosinophilia with numerous eosinophils white blood cells, anti-parasite immune system.
    Cancer invasion into surrounding tissues, conceptual computer illustration. — Stock Photo
    Cancer invasion into surrounding tissues, conceptual computer illustration.
    Colored illustration showing abundant lymphoblast cells in human bone marrow smear in acute lymphoblastic leukaemia. — Stock Photo
    Colored illustration showing abundant lymphoblast cells in human bone marrow smear in acute lymphoblastic leukaemia.
    Breast tissue showing adenocarcinoma — Stock Photo
    Breast tissue showing adenocarcinoma
    Bloodstream showing red blood cells — Stock Photo
    Bloodstream showing red blood cells
    Ebola virus particle in blood stream, digital illustration. — Stock Photo
    Ebola virus particle in blood stream, digital illustration.
    Blood clot, computer illustration — Stock Photo
    Blood clot, computer illustration
    Measles virus particles, digital illustration. — Stock Photo
    Measles virus particles, digital illustration.
    Illustration of abnormal red blood cells known as spur cells acanthocytes. — Stock Photo
    Illustration of abnormal red blood cells known as spur cells acanthocytes.
    Closeup of Amoeba, computer illustration — Stock Photo
    Closeup of Amoeba, computer illustration
    Digital 3d colored illustration of cancer cell in process of mitosis. — Stock Photo
    Digital 3d colored illustration of cancer cell in process of mitosis.
    Human sperm cells — Stock Photo
    Human sperm cells
    Cancer cell anatomy — Stock Photo
    Cancer cell anatomy
    Astrocyte brain glial cell connecting neuronal cells to blood vessel, digital illustration. — Stock Photo
    Astrocyte brain glial cell connecting neuronal cells to blood vessel, digital illustration.
    Brown Adenovirus particles, colored digital 3d illustration. — Stock Photo
    Brown Adenovirus particles, colored digital 3d illustration.
    Plasmodium vivax protozoa and red blood cells, digital illustration. — Stock Photo
    Plasmodium vivax protozoa and red blood cells, digital illustration.
    Cancer cells dividing — Stock Photo
    Cancer cells dividing
    Lymphocyte white blood cell in blood smear, digital illustration. — Stock Photo
    Lymphocyte white blood cell in blood smear, digital illustration.
    Sporangium fungal cell with spores — Stock Photo
    Sporangium fungal cell with spores
    Blood clot formation — Stock Photo
    Blood clot formation
    Smear from oral cavity showing oral trichomonas and buccal epithelial cells, digital illustration. — Stock Photo
    Smear from oral cavity showing oral trichomonas and buccal epithelial cells, digital illustration.
    Closeup of abstract background with round shaped cells of vaccine of different sizes illuminated by colorful light — Stock Photo
    Closeup of abstract background with round shaped cells of vaccine of different sizes illuminated by colorful light
    Plasmodium ovale protozoan parasites and red blood cell in flow, computer illustration. — Stock Photo
    Plasmodium ovale protozoan parasites and red blood cell in flow, computer illustration.
    Digital illustration of cross-section of blood vessel with acute lymphoblastic leukaemia showing abundant lymphoblasts. — Stock Photo
    Digital illustration of cross-section of blood vessel with acute lymphoblastic leukaemia showing abundant lymphoblasts.
    Red blood cells — Stock Photo
    Red blood cells
    Illustration showing different types of blood cells, erythrocytes, neutrophil, monocyte, basophil, eosinophil, lymphocyte, and platelets. — Stock Photo
    Illustration showing different types of blood cells, erythrocytes, neutrophil, monocyte, basophil, eosinophil, lymphocyte, and platelets.
    Lung cancer, digital illustration and light micrograph of cancerous tissue. — Stock Photo
    Lung cancer, digital illustration and light micrograph of cancerous tissue.
    Sperm cells in seminiferous tubules — Stock Photo
    Sperm cells in seminiferous tubules
    T-cells (turquoise) binding to cancer cells (pink), illustration. T-lymphocytes, or T-cells, are a type of white blood cell and components of the body's immune system. They mature in the thymus — Stock Photo
    T-cells (turquoise) binding to cancer cells (pink), illustration. T-lymphocytes, or T-cells, are a type of white blood cell and components of the body's immune system. They mature in the thymus
    3d digital illustration of narrowed blood vessel. — Stock Photo
    3d digital illustration of narrowed blood vessel.
    White blood cell — Stock Photo
    White blood cell
    Conceptual digital illustration of human blastocyst on needle tip. — Stock Photo
    Conceptual digital illustration of human blastocyst on needle tip.
    Close-up of honeycomb on plate and jars of fresh honey on rustic table — Stock Photo
    Close-up of honeycomb on plate and jars of fresh honey on rustic table
    Digital illustration of virus particles on plain background. — Stock Photo
    Digital illustration of virus particles on plain background.
    Stem cell research — Stock Photo
    Stem cell research
    Blood cells and Plasmodium sp. parasites (at schizont stage) causing malaria, computer illustration. — Stock Photo
    Blood cells and Plasmodium sp. parasites (at schizont stage) causing malaria, computer illustration.
    White blood cells, digital illustration. — Stock Photo
    White blood cells, digital illustration.
    Digital illustration of green bacteria cells on white background. — Stock Photo
    Digital illustration of green bacteria cells on white background.
    Entamoeba histolytica engulfing red blood cells — Stock Photo
    Entamoeba histolytica engulfing red blood cells
    Axon connections between cells — Stock Photo
    Axon connections between cells
    Closeup of abstract background with round shaped cells of vaccine of different sizes illuminated by colorful light — Stock Photo
    Closeup of abstract background with round shaped cells of vaccine of different sizes illuminated by colorful light
    Fat cells structure, computer illustration. — Stock Photo
    Fat cells structure, computer illustration.